Enhanced room temperature gas sensing of aligned Mn3 O4 nanorod assemblies functionalized by aluminum anodic membranes

Nanotechnology
Neetha JohnK E Abraham

Abstract

The study includes a conductometric chemical sensor design using aligned Mn3O4 nanorods. Nanostructuring is an emerging field of prominence due to its capacity to introduce unprecedented properties in materials with potential applications. A hydrothermally prepared in situ Mn3O4 sample appears with an urchin rod-like morphology, which changes to a spherical shape upon annealing. An aluminum anodic membrane/template (AAO) is used for the growth of the nanorods and also as a medium to support the sensor. The aligned Mn3O4 nanorods are formed in the pores of the AAO by vacuum infiltration approach, which is later on annealed. The gold electrical contacts are deposited on the top or bottom ends of the Mn3O4-embedded AAO to ensure conductometric sensing along the length of the Mn3O4 nanorods. In comparison to the Mn3O4 film-based sensor, the Mn3O4 nanorods in the AAO template have enhanced sensitivity for detecting ethanol and acetone vapor at room temperature. The novel property observed is a result of the large surface area and number of oxygen vacancies of the uniformly aligned and parallel assemblies of the nanorods. The sensor exhibits the lowest response time at 4 s for ethanol and 2 s for acetone at room temperature with a co...Continue Reading

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